Disk plow



April 21, 1953 w. H. SILVER ETAL 2,635,517

DISK PLOW Filed Jan. 26, 1946 3 Sheets-Sheet l April 21, 1953 w. H.SILVER ETAL 2,535,517

DISK PLOW Filed Jan. 26, 1946 5 Sheets-Sheet 2 FIG. 2

INVENTORS WALTER* H. SILVER WILLIAM V. LOHR A April 2l, 1953 w. H.SILVER ETAL 2,635,517

DISK PLOW Filed Jan. 26, 1946 3 Sheets-'Sheet 5 l y y l l AT EYSPatented Apr. 21, 1953 DISK PLOW Walter H. Silver, Moline,- lll., andWilliam V. Lohrman, Davenport, Iowa, assignors to Deere & Company,Moline, Ill., a corporation of Illinois Application January 26, 1946,Serial No. 643,512

17 claims. 1

The present invention relates generally to tractor mounted implementsand is more particularly concerned with ground working tools such asplows and the like.

The object and general nature of the present invention is the provisionof a tractor mounted implement particularly arranged and constructed forquick and easy connection with and disconnection from the tractor. Moreparticularly, it is a feature of this invention to provide asemiintegral disk plow adapted to be connected with and disconnectedfrom its supporting tractor merely by manipulating two or three parts,which may be done easily and conveniently in a very short period oftime. A semi-integral implement is one which is supported partly on itsown ground wheel or wheels and partly on the tractor which propels it.

More specifically, it is an important feature of this invention toprovide a semi-integral quick detachable implement which is supported atits front end on the tractor and at its rear end on a ground wheel, andit is a further feature of this invention to provide a steeringconnection between the rear furrow wheel and a part of a hitch thatmoves generally laterally with the tractor whereby the outfit mayoperate satisfactorily along curved terraces and under other conditionswhere more or less turning is required. Still further, it is a featureof this invention to provide a semi-integral implement, such as a plow,in which a support or beam structure is provided whereby raising orlowering the front end thereofserves to control the depth of operationand in which articulated parts are provided so that raising theintermediate portion of the support or beam structure, as by the powerlift bail or other member on the tractor, serves to raise the groundworking tools into a transport position and generally about the rearwheel of the implement as a fulcrum.

It is also a feature of this invention to provide a semi-integralimplement connected with the tractor for lateral swinging movement andraised and lowered by the power lift member on the tractor, withconnections especially constructed to accommodate any lateral swingingof the implement relative to the tractor without affecting the actionand/or efficiency of the lifting arrangement.

These and other objects and advantages of the present invention will beapparent to those skilled in the art after a consideration of thefollowing detailed description, taken in conjunction with theaccompanying drawings. in which Figure 1 is a side view of asemi-integral tractor mounted disk plow in which the principles of thepresent invention have been incorporated. Figure 2 is a plan view of theimplement shown in Figure 1.

Figure 3 is a perspective view of the plow shown in Figures 1 and 2,with the exception that the means for raising' the rear end of the plowrelative to the rear furrow wheel has been omitted.

Referring now more particularly to Figures 1 and 2, the tractor isindicated in its entirety by the reference numeral I and includes a pairof front wheels and a pair of rear traction Wheels 3 mounted on axleshafts 4 that are carried in extensions 5 forming a part of the rearaxle structure 6 of the tractor. The tractor includes a power plant Iand a power lift unit 8 of the hydraulic type, including suitable valvemechanism V and other necessary parts, such as a pair of lift arms IIand links I2 connecting the arms I I to lugs I3 formed on the sidemembers I4 of a generally vertically swngable tractor drawbar or bailmember I5. The latter is preferably in the form of a U-shaped member,considered as a whole, and includes a rear transverse section I6 whichmay be formed of round stock. The sides I4 may be strap members, and thelatter are pivoted at their front ends, as at I'I, to drop housings I8which form a part of the tractor rear axle structure 6. Preferably, therear part I6 is welded or otherwise permanently secured to the sideparts I4 of the tractor drawbar or bail I5. The two power lift arms I Iare clamped or other- Wise fixed in any suitable manner to the ends of apower lift rockshaft 20 which forms a part of the hydraulic unit 8. Asbest shown in Figure 2, a lug 24 is welded or otherwise permanentlyfixed to the central section I6 of the tractor drawbar I5 and isapertured to receive the hitch connection of an implement adapted to beconnected therewith, such as a semi-integral disk plow of the typedescribed below. The unit 8 is so constructed that the drawbar I5 iscapable of swinging upwardly freely but its lower position is determinedby the position of the valve V and associated parts. Hydraulic mechanismof this type is shown in U. S. Patent 2,477,710, issued August 2, 1949,to Charles C. Worstell, to which reference may be made if necessary.

The disk plow that is adapted to be attached to the tractor I isindicated in its entirety by the reference numeral 30 and comprises aplow beam structure 3l of the articulated type. Specically, the member3| is made up of a forward plow beam section 32 and a rear plow beamsection 33. The rear beam section 33 preferably is in the nature of agenerally diagonally extending square bar having its forward end portionbent so as to extend laterally or transversely, as indicated at 36 inFigure 2. This portion of the plow beam structure is adapted to behingedly connected as well as pivotally connected with the tractordrawbar I by means that includes an attachment socket member ordrawbar-receiving member, indicated in its entirety by the referencenumeral 38. This member, which may be constructed of flat plate or sheetstock bent or shaped so as to provide an upper plate section 4| and alower plate section 42, the sections being spaced apart so as to receivethe tractor drawbar lug 24, the rear portion of the member 38 beingcurved so as to snugly receive the laterally directed front end section36 of the rear plow beam section 33. rected front end section 36 isrounded, whereby the rear plow beam member 33 may pivot relative to theattachment member 38 about a generally transverse axis. Thus, theconnection between the drawbar-receiving member 38 and the plow beamsection 33 is in the nature of a hinge, in which the hingedly connectedparts may swing upwardly and downwardly, one relative to the other abouta, transverse axis, yet the fairly wide contact between the member 38and the tractor drawbar I5 serves to stabilize the plow beam structure3| and prevents the same from being displaced about a generallylongitudinal axis.

'I'he forward plow beam section 32 comprises a pipe or rod in the formof a boom having an upturned portion 46 at its rear end. This part 46 isdisposed within a vertical sleeve section 41 that forms a part of aswivel member 5|. This member also includes a horizontal sleeve section49, the sections 41 and 49 being welded or otherwise secured rigidlytogether. The section 49 is disposed on the laterally turned end 36 ofthe rear plow beam section 33, the plate sections 4| and 42 being cutout, as at 46, for this purpose. In this way, the two plow beam sections32 and 33 are hingedly connected together for movement one relative tothe other about a transverse axis as defined by the beam end 33. A chain53 is connected at its forward end to a lug 54 welded to the rearportion of the front plow beam section 32. At its rear end the chain 53is engaged with a hook 55 that; is bolted or otherwise fixed to the rearplow beam section 33. The chain 53 serves as a limit preventing upwardswinging of either of the plow beam sections relative to the otherbeyond the position shown in Figure l, or, in other words, each of thetwo plow beam sections 32 and 33 is rigid against vertical displacementin an upward direction relative to the other from the position shown inFigure 1. The front end of the forward plow beam section 32 is receivedin a suspension yoke 6|, which preferably is in the form of a bailmember swingably connected to the rear ends of a pair of arms 62 whichare fixed to a transverse rockshaft 63. The latter also has arms 65rigidly vsecured thereto, as by welding, and the arms 65 are connectedby links 66 to vertical arms 61 that are fixed to the sides I4 of thetractor drawbar I5, preferably adjacent the pivotal connection I1between the tractor drawbar I5 and the tractor drop axle housings I8.

The rear end of the plow beam structure is supported on a rear furrowwheel .10 which is journaled on the laterally -outturned end 1| of a Thelaterally divertical spindle 12. The latter is slidably and rotatablydisposed in a sleeve section 13 which is fixed to an angular bracket 14,such as by welding, and the forward end 15 of the bracket 14 is disposedbetween the upper and lower plates 16 and 11 of an attaching bracketstructure 18 which is bolted, as at 19 and 80, to the rear plow beampart 33. The bracket plates 16 and 11 are welded to the upper end of adisk standard 8|, the lower end of which carries suitable bearing means82 to receive the associated disk furrow opener 84. As best shown inFigure 2, the upper and lower plates 16 and 11 are apertured to receivea pair of bolts 86 and 81 by which the bracket 14 is secured firmly andrigidly to the disk standard bracket plates. The bracket 14 may beadjusted angularly in a horizontal plane by virtue of providing slotsand/or a number of apertures in the plates 16 and 11 to receive thebolts 86 and 81. The plates 16 and 11 are similarly adjustable on theplow beam bar 34.

A forward disk furrow opener 94 is mounted, by bearing means 95 on thelower end of a disk standard 96, and the latter is fixed, as by welding,to a pair of upper and lower plates 91 and 98, and the plates 91 and 98are adjustably connected to the plow beam bar 33 in the same manner asthe rear plates 16 and 11. Preferably, both of the disk standards 8| and93 extend upwardly beyond the upper plates 16 and 91 so as to providefor the attachment of scraper supporting arms. For purposes of clarity,the scrapers, which are conventional, have been omitted.

The plow beam, which constitutes the main frame of the plow, may beraised and lowered relative to the rear furrow wheel by swinging a bellcrank |06, the rear arm |01 of which is connected by a crank screw |08to a swivel |09 carried at the upper end of the rear furrow wheelspindle 12. The other arm of the bell crank |06 is connected by a link||2, which may be made adjustable as necessary, to a swivel eye ||3which is carried on a vertical bracket |I4 that is welded or otherwisexed to the attachment Socket member 38. A steering arm ||1 is alsoconnected to the upper end of the furrow wheel spindle 12 and extendslaterally outwardly therefrom. The outer end of the arm ||1 is aperturedto receive the rear end of a steering link II8, the forward end of whichis pivotally connected to the outer end of an arm IIS that is rigidlysecured to the upper end of the vertically disposed portion 46 of theforward plow beam bar 32. The bell crank |06 is rockably mounted on a,stub shaft |2| that is carried by a bracket |22 bolted, as at |23, tothe bar 14. A sleeve |24 is fixed to the bracket |22 and providesbearing support thereon for the stub shaft |2I. The steering link ||8comprises two relatively movable parts, the first comprising a sleeve|25, the forward end of which includes a hook section |26 that ispivotally connected with the outer end of the arm H9, and a rear section|21 which is slidable in the sleeve section |25 and is threaded at itsrear end, as indicated at |28. This end is adjustably connected by meansof a swivel |29 to the outer end of the steering arm ||1. For holdingthe two link members |25 and |21 in any position of adjustment, weprovide a sector |33 that is fixed, as by welding, to the sleeve section|25, and pivotally connected to the sector |33 is a hand lever |34 towhich an adjusting link |35 is pivoted at its forward end. The rear endof the link |35 is pivotally connected by an adjustable clamp collar |36to the rear vlink section |21. By releasing the detent mecha nism of thehand lever |34 and swinging the latter in one direction or the other,the effective length of the link structure IIS may be adjusted so as tovary the relation between the steering arms Ii'I and IIS. Thisadjustment may be necessary at times in order to give the proper lead tothe rear furro-w wheel 10.

The operation of the implement described above is substantially asfollows. When in operating or plowing position, the parts are disposedas shown in Figure 1. If it should be desired to decrease the depth ofplowing, the operator operates the valve mechanism V so as to raise thetractor drawbar I5 the desired amount. The upward swinging of thedrawbar I5 exerts a forward thrust through the links 56, swinging thepairs of arms 62, 65 so as to raise the bail or yoke 6I, thus raisingthe front end of the plow beam structure, specifically, the front end ofthe forward plow beam section 32. Since in operating position the draftforce is applied to the front end of the rear plow beam section 33 at arelatively high point while the soil resistance is applied to the lowerportions of the disks 84 and 94, there is a tendency for the rear end ofthe rear beam section to swing upwardly relative to the front beamsection 32 and the drawbar I5 about the transverse axis defined by thelaterally extending beam portion 36. This movement is, however, resistedby the chain 53, as best shown in Figure, 1. Therefore, in operation,the chain 53 forms a rigid connection between the two plow beamsections. The linkages are so arranged that the front end of the rearbeam section 33 and the lifting bail 6I supporting the front end of thefront beam section 32 are raised and lowered substantially the sameamount. When the drawbar I5 is raised the front beam section 32 islifted bodily but the rear furrow wheel 'l0 remains in contact with theground, the rear beam section 33 pivoting downwardly about the aforesaidtransverse axis relative to the drawbar I5 and the front beam section32. As a result, the connecting chain 53 momentarily is slackened, butas soon as the rear furrow wheel 'I0 has moved forward a few feet, itbegins to run along the bottom of the furrow that is now becoming moreshallow, so that after a short distance the furrow openers 84 and 94 arebrought back to a level relation but at the desired reduced depth ofoperation and the chain 53 again becomes taut.

From this description it will be seen that in operation the two hingedlyconnected plow beam sections 32 and 33 are so connected and arranged ast act as a rigid part, since the chain 53 holds the rear beam section 33at a given angle relative to the front beam section 32. However, if therear wheels of the tractor should pass over a ridge or the like, therear wheel 'I0 would remain on the ground and the rear or main .beamsection 33 would pivot downwardly, relative to the tractor and the frontbeam section 32, about the transverse axis at 36, which would cause thechain 53 to slacken momentarily until the tractor wheels passed beyondthe ridge. 'When the rear furrow wheel 10 reached the ridge, the entireplow, including the front and rear beam sections 32 and 33, would shiftupwardly, together with the tractor drawbar I5, the power lift unit 8permitting the relatively free upward movement of the drawbar Iasexplained above. Substantially the same action takes place when, forexample, the rear wheels 3 of the tractor momentarily drop into adepression or low place in the ground. The connection 53 may bemadeadjustable by any suitable means, such as by hooking one or the other ofdifferent links of the chain 53 in the hook 55. Preferably, the latteris mounted on the lower end of the bolt 19. Since the soil pressureagainst the disks 84 and 94 acts at points below the connection betweenthe drawbar I5 and the beam bar 33, and the chain 53 prevents the bar 33from swinging upwardly about the transverse axis at 36 relative to thedrawbar I5 and the front bar 32, the front 1 end of the plow beam bar 32is caused to bear'v As best shown in Figure 2, the plow may f swinglaterally relative to the tractor either in one direction or the otherabout the pivot bolt 43 as an axis. ticularly when operating around acurve, as when following or running parallel to terraces, grass stripsand the like.

43 the forward plow beam section 32 is held against swinging relative tothe tractor, except for the movement that results from the lateraldisplacement of the upturned end 46, and therefore when the plow swingslaterally about the. pivot 43 the arm II9 will act through the link'-vIIB and the rear steering arm III to steer the rear furrow wheel so thatit takes a position with respect to the line of travel that accommodatesthe turning of the outfit.

When it is desired to raise the plow into al transport position, thetractor valve mechanism V is operated to raise the tractor drawbar I5the full amount, this being the position shown in Figure 3. During theraising action the point of hinged connection between the front and rearbeam plow sections is, of course, raisedand hence the chain 53 goesslack since the axis defined by the beam section 36 is raised and theconnection points 54 and 55 brought closer together. As the drawbar isswung upwardly, the front end of the rear plow beam structure 33 israised and the furrow openers 84 and 94 lifted entirely out ofengagement with the ground, the implement swinging about the rear furrowwheel 10 of a fulcrum. At the same time,A the forward swinging of thevertical arm II4 exe,` erts a pull on the link H2 which swings the bellcrank I DB (Figure 1) ina counterclockwise direction and raises the rearend of the plow beam relative to the rear furrow wheel 10.

When it is desired to disconnect the implement from the tractor, allthat it is necessary to do is to remove the single pivot pin 43 anddrive away with the tractor. If desired and necessary, a stand may beprovided for holding the plow in upright position when detached from thetractor. The implement may be reattached to the tractor, merely bybacking the latter into position, raising or lowering the drawbar of thetractor by the power lift unit until the rear bar I 6 passes in betweenthe attaching plates 4I and 42 into a position to facilitate theinsertion of the pivot pin 43. At the same time that the drawbar part I6starts in between the plates 4I and 42, the front end of the beamsection 32 is held in position to pass into the yoke or bail 6I.' Tothis end, a second stand may be `provided 'for holding' the front end ofthe plow This action is necessary, par.

When the plow pivots relative to the tractor about the vertical axisAanadur-r beam bar 32` in. position, or it` is. a relatively' simple,matter tov block` up the same in the,prop. er position for reattachingwhenl disconnect,- ing theY implement. In some` cases it may not beAnecessary to raisey the rear. end of the plow frame relative to thevrear furrow wheel 10, and

in. such instances the raising link lf2 and assoelated parts may be`omitted, this being the construction shown in FigureA 3. In this case,the rearV sleeve section 13 isvheld against vertical displacement on thespindle 12 by collars |30 or the like.

While we have shown and described above the preferred structure in whichthe principles of the present inventionhave been incorporated, it

is to be understood that our invention is not to be limited to theparticular details shown and described above, but that, in fact, widelydifferent means may be employed in the practice of the broader aspectsof our invention.

What we claim, therefore, and desire to secure by Letters. Patent is:

1. A tractor mounted plow comprising a generally longitudinallyextending plow beam comprising front and rear sections hingedlyconnected together, furrow opening means carried by the rear sectionoftheY plow beam, said tractor having-a draft transmitting memberconnected at one.- end to the tractor, means for connecting the. otherend of. said member to the front end of Y saidI rear plow beam section,means acting against said sections` and accommodating downward pivotingof the rear plow beam section but limiting the upward pivoting of therear plow beam section relative to the forward section, and meansadapted to act` between the tractor andthe front plow beam section forraising and lowering the forward end portion of said front sectionrelative to the tractor so as to control the depth of plowing.

2. A tractor mounted plow comprising a generally longitudinallyextending plow beam comprisingv front and rear sections hingedlyconnected together, furrow opening means carried bythe rear section ofthe plow beam, said tractor having aY draft transmitting memberconnected at one end to thetractor, means for connecting the other endof said member to the front por'- tionof said' rear plow beam section,ground engaging means at the rear end of said rear section rearwardlyofA said furrowopeners, means acting against said sections andaccommodating downward pivoting of the rear plow beam sectionv butlimiting the upward pivotingl of the rear plow beam section relative tothe forward section, means connected with the front plow beam sectionfor raising and lowering the forward end portion thereof so as tocontrol the depthv of plowing; and generally upwardly acting meansconnected with said plow beam ad'- jacent the hinged connection betweensaid sections for raising the hingedly connected portions of. said beamsections relative to the front portion of said front plow beamsectionand relative to said ground engaging means at the rear end of.saidrear. plow-beam section so as toraise the. furrow openers out ofcontact with the ground.

3. A plow adaptedy to bel connected to a tractor, including a plow beamcomprising front and rearV sections hingedly connected together forrelatively free, movement in at least one. direc.- tion. one relative;to the other, about;` a generallyy verticall axis,A furrow opening meanscarried by the roar section. of the plow beam, said tractor having adraft transmitting member, means for connecting saidV draft transmittingmemberto the front endv of said rear section, means acting between saidbeam sections for limiting the upward pivoting of the rear plow beamsection relative, to the forward section, and means connected with thefront plow beam section for raising, and lowering the forward endportion thereof so as to control the depth of plowing.

4. In a tractor mounted plow adapted to be connected to a tractor havinga rear drawbar and means for raising the drawbar, a plow beam comprisingfront and rear sections hingedly connected together for relatively freemovement in one direction, a rear furrow wheel carried by the rear endof the rear. beam section, a furrow opener also. carried by said rearbeam section forwardly of said rear furrow wheel, means adapted to becarried by the tractor and engageable with the front'I end of saidfrontbeam section for raising and lowering the latter, means engageablewith said plow beam adjacent. the hinged connection between the. frontand rear sections of said beam for raising saidrear section and. saidfurrow openers, and means connected between said beam sections forlimiting the downward pivoting of the hingedly connected portions of thefront and rear beam sections relative tothe end portions of said frontand rear beam sections, whereby the rear furrow wheel and front' beamsection may determine the depth of operation of said furrow opener.

5. A plow adapted to be connected to a tractor, including a plow beamcomprising front and rear sections hingedly connected together formovement, one relative to the other, about transverse and vertical axes,a rear dirigible furrow wheel and a furrow opener carried by the rearsection of said plow beam, said tractor having draft means forconnnecting the front portion of the rear beam section to the tractorand accommodating lateral swinging of said rear beam relative to thetractor and the front beam section,

a steering linkage connecting said dirigible rear4 wheel with said frontbeam section, meansV acting between said beam sections for limiting theupward pivoting of the rear plow beam section relative to the forwardsection, generally upwardly acting means connected with said plow beamadjacent the hinged connection between said sections for raising thehingedly connected portions of said beam sections relative to the frontportion of said front plow beam section and relative to said rear furrowwheel so as to raise the furrow openers out of contact with the ground,and means adapted to be carried on the tractor and connected with thefront plow beam section for raising and lowering the forward end'portion thereof so as to control the depth of plowmg.

6. A semi-integral tractor plow comprising an articulated beam structureincluding two hingedly' connected sections, meansA connecting saidsections whereby the hingedly connected portions of said sections areheld against downward deflection relative to the end portions of saidbeam sections opposite said hingedly connectedA portions but said endportions are capable of pivoting downwardly one relative to the other, arear furrow wheel connected to the rear portion of the rear section, afurrow opener fired to the rear section forward of said rear furrowwheel, draft transmitting means, means for connecting said drafttransmitting means with theA forward end of the rear section, and meansconnected with said beam adjacent the hinged connection 'of saidsections for raising the furrow opener out modating upward movement ofthe interconnected end portions of said sections, a ground engaging partat the rear end of said rear section, means connected with said beamstructure forv raising and lowering said rear section about said groundengaging part as a fulcrum, plowing means carried by said rear sectionforward of said part, and means connected with the front end of thefront section interconnected withsaid raising and lowering means forcontrolling the -depth of plowing,

8.- A semi-integral tractor mounted plow comprising a beam stuctureincluding a 'generally diagonally extending beam member having itsforward end shaped to extend laterally, a furrow opener carried by saidbeam member, means hingedly connected with the laterally extendingforward portion of said beam member for connecting the latter to thetractor, a rear furrow wheel at the rear end of said beam member, aforwardly extending part,. means providing a pivotal connection betweenthe rear portion of said part and the forward portion of said beammember whereby said beam member and part may swing each relative to theother about a transverse axis, and means connected with said beam memberand said part for limiting the upward movement of said part relative tosaid beam member about said transverse axis, whereby raising andlowering the front end of said part serves to raise and lower saidfurrow opener relative to said rear furrow wheel and thereby control thedepth of plowing.

9. A semi-integral tractor implement adapted to be connected to atractor having a bar-receiving part, said implement comprising a beamsection, connecting means for connecting said beam section with thetractor for movement relative thereto about a generally vertical axis, adirigible rear wheel carried at the rear end of said beam section, aground engaging tool carried by the latter forward of said rear wheel, abar having a pivotal connection at its rear end with the forward portionof said beam structure and movable relative to the latter about agenerally vertical axis, the forward end of said bar being received bythe bar-receiving part on the tractor, a steering arm i'lxed to saidbar, a steering arm connected to steer said rear wheel, and a connectionbetween said arms whereby when said implement pivots laterally relativeto the tractor, the movement between the implement and said bar servesto steer said rear wheel.

10. The invention set forth in claim 9, further characterized by saidrear furrow wheel being shiftable vertically relative to the rear end ofsaid beam member, said connecting means including hitch means forconnecting the forward end of said beam member with the tractor andshiftable generally vertically to raise the furrow opener out ofoperating position, and means connected with said vertically shiftablehitch means forraising the beam structure relative to the rear furrowwheel when said hitch means is shifted to'v raise the furrow opener outof the ground.

11. For use with a tractor having a drawbar, an agricultural machineincluding a beam membervdisposed in a generally longitudinal position, adrawbar-receiving part at the front portion of said beam member, adirigible wheel fo-r supporting the rear end of said beam member, meansfor connecting said drawbar-receiving part with the tractor drawbar,pivot means connecting said beam member with said drawbar-receivingpart, a control bar adapted to be connected at its forward end with thetractor, means pivotally connecting the rear end of said control barwith the front portion of said beam member for movement relative theretoabout a 'generally vertical axis, vand a steering connection between therear por'- tion of said control bar and said dirigible wheel forsteering the latter in accordance with changes in the position of thebeam member relative to the tractor. 12. A tractor propelledagricultural implement comprising a beam member including sectionspivotally connected together for movement one relative to the otherabout a generally vertical axis, means connecting the forward portion ofthe rear section to' the tractor for movement relative thereto abo-ut agenerally vertical axis,

a dirigible rear wheel at the rear of Said rear beam section, means forconnecting the forward end portion of said forward Vbeam section to thetractor whereby when said rear section swings laterally relative tothetractor a portion of the forward end of .saidforward section is heldagainst lateral movement relative to the tractor, and a steeringconnection between said forward beam section and said rear dirigiblewheel.

13. A tractor propelled agricultural implement comprising a beam memberincluding sections pivotally connected together for movement onerelative to the other about a generally vertical axis but held againstrelative movement in a generally vertical direction whereby raising theforward end of the front section serves to raise the rear beam section,ground working tool 4means on saidl rear section, means connecting theforward portion of the rear section to the tracto-r for movementrelative thereto about a generally vertical axis, a dirigible rear wheelat the rear of said beam section, means for connecting the forward endportion o-f said forward beam section to the tractor whereby when saidrear section swings laterally relative to the tractor a portion of theforward end of said forward section is held against lateral movementrelative to the tractor, means on the tractor for raising the front beamsection to control the depth of operation of said tool means, and asteering connection between said forward beam section and said reardirigible wheel,

14. An implement adapted to be connected with a tractor, comprising aframe, ground working means carried thereby, means mounting the forwardend of said frame on the rear portion of the tractor and includingpivotally interconnected parts swingable one relative to the other abouta generally vertical axis, a rear dirigible wheel supporting the rearend of said frame, a bar pivotally connected at its rear portion withsaid frame and connectible at its forward portion with the tractor toturn laterally with the latter relative to said frame, and a steeringconnection between said bar and rear dirigible wheel,

15. For use with a tractor having a generally vertically swingable powerlift operated drawbar,

11 the improvement comprising `a vgenerally fore and aft extending plowbeam member carrying one or more furrow openers, a front beam sectionincluding a forward `part adapted to extendv forwardly underneath thetractor, a swingable support adapted to be carried by vthe tractor andconstructed to engage and support the front portion of. said part, therear portion of said front beam section having an Vupwardly extendedpart, a hinged connection between the 'front end of said plow beammember and the' rear portion of said front beam section providing forgenerally vertical movement of said plow beam relative. to said frontbeam section, an adjustable connection extending from said upwardlyextended part to the rearward portion of said plow beam member, and apart hingedly connected to the iront end of said plow beam member andconstructed Yto receive said tractor drawbar whereby upward movement kofthe latter serves to lift said plow beam member.

16. For use with a tractor .having a: generally vertically swingablepower lift operated drawbar and a forwardly disposed .bar-receiving bailmounted for generallyV vertical movement relative to the tractor andinterconnected with said' drawbar so as to be operated thereby: theimprovement comprising a generally fore and ait extendlng plow beammember carrying one or more furrow openers, a front beam vsectionincluding a forward'part adapted to extend forwardly underneath thetractor to be engaged lby'said bail, the rear portion of said front beamsection having an upwardly extended part, a hinged connection betweenthe iront end of said plow beam member and the rear portion of saidfront beam section providing for generally vertical movement of saidplow beam relative to said front beam section, an adjustable connectionextending from said upwardly extended Vpart to the rearward portion ofsaid plow beam member. and a part hingedly connected to the front end ofsaid plow beam member and constructed to receive said tractor drawbarwhereby upward movement of the latter serves to lift said plow beammember.

17. For use with a tractor having a generally vertically swingable powerlift operated drawbm', the improvement comprising a generally fore andaft extending plow beam member carrying one or more furrow openers, afront beam section including a forward part adapted to extend forwardlyunderneath the tractor, a swingable support adapted to be carried by thetractor and constructed to engage and support the front portion of saidpart, the rear portion of said front beam section having an upwardlyextended part, a connection between the front end of said plow beam-member and the rear portion of said front beam section providing forboth generally vertical and generally lateral swinging movement of saidplow beam relative to said front beam section, ay steerable rear wheelsupporting the, rear end of said beam member, an arm xed to the upwardlyextended part of said front beam section, an adjustable connectionextending from said arm to said steerable rear wheel, and a parthingedly connected to the front end of said plow beam member andconstructed to receive said tractor drawbar whereby upward movement ofthe latter serves to lift said plow beam member about said rear wheel asa fulcrum.

WALTER H. SILVER. WILLIAM V. LOHRMAN. y

References Cited in the le of this patent UNITED STATES PATENTS FOREIGNPATENTS Country Date France Oct. 15, 1914 Italy Aug. 6, 1930 Italy June15, 1937 Number Number

